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From e7e3e1d230c15079a3d1480c47076ffd89f1de63 Mon Sep 17 00:00:00 2001
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From: Michal Sekletar <msekletar@users.noreply.github.com>
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Date: Mon, 16 Oct 2017 16:15:05 +0200
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Subject: [PATCH] mount: make sure we unmount tmpfs mounts before we deactivate
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 swaps (#7076)
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In the past we introduced this property just for tmp.mount. However on
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todays systems usually there are many more tmpfs mounts. Most notably
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mounts backing XDG_RUNTIME_DIR for each user.
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Let's generalize what we already have for tmp.mount and implement the
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ordering After=swap.target for all tmpfs based mounts.
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(cherry picked from commit fab35afabf01a5dea651187a1ccb5ae7cd778f9d)
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Conflicts:
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	src/core/mount.h
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Resolves: #1437518
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---
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 src/core/dbus-mount.c | 10 +---------
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 src/core/mount.c      | 24 ++++++++++++++++++++++++
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 src/core/mount.h      |  1 +
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 units/tmp.mount       |  1 -
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 4 files changed, 26 insertions(+), 10 deletions(-)
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diff --git a/src/core/dbus-mount.c b/src/core/dbus-mount.c
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index 53fe4edc34..04beba631b 100644
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--- a/src/core/dbus-mount.c
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+++ b/src/core/dbus-mount.c
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@@ -90,20 +90,12 @@ static int property_get_type(
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                 sd_bus_error *error) {
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         Mount *m = userdata;
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-        const char *d;
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         assert(bus);
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         assert(reply);
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         assert(m);
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-        if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.fstype)
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-                d = m->parameters_proc_self_mountinfo.fstype;
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-        else if (m->from_fragment && m->parameters_fragment.fstype)
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-                d = m->parameters_fragment.fstype;
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-        else
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-                d = "";
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-
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-        return sd_bus_message_append(reply, "s", d);
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+        return sd_bus_message_append(reply, "s", mount_get_fstype(m));
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 }
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 static BUS_DEFINE_PROPERTY_GET_ENUM(property_get_result, mount_result, MountResult);
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diff --git a/src/core/mount.c b/src/core/mount.c
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index 7ca7f5a258..a6d93b8691 100644
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--- a/src/core/mount.c
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+++ b/src/core/mount.c
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@@ -119,6 +119,21 @@ static bool needs_quota(const MountParameters *p) {
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                                  "usrquota\0" "grpquota\0" "quota\0" "usrjquota\0" "grpjquota\0");
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 }
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+const char *mount_get_fstype(const Mount *m) {
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+        const char *type = NULL;
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+
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+        assert(m);
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+
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+        if (m->from_proc_self_mountinfo && m->parameters_proc_self_mountinfo.fstype)
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+                type = m->parameters_proc_self_mountinfo.fstype;
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+        else if (m->from_fragment && m->parameters_fragment.fstype)
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+                type = m->parameters_fragment.fstype;
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+        else
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+                type = "";
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+
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+        return type;
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+}
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+
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 static void mount_init(Unit *u) {
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         Mount *m = MOUNT(u);
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@@ -236,6 +251,7 @@ _pure_ static MountParameters* get_mount_parameters(Mount *m) {
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 static int mount_add_mount_links(Mount *m) {
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         _cleanup_free_ char *parent = NULL;
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+        const char *fstype;
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         MountParameters *pm;
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         Unit *other;
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         Iterator i;
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@@ -292,6 +308,14 @@ static int mount_add_mount_links(Mount *m) {
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                 }
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         }
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+        /* If this is a tmpfs mount then we have to unmount it before we try to deactivate swaps */
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+        fstype = mount_get_fstype(m);
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+        if (streq(fstype, "tmpfs")) {
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+                r = unit_add_dependency_by_name(UNIT(m), UNIT_AFTER, SPECIAL_SWAP_TARGET, NULL, true);
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+                if (r < 0)
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+                        return r;
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+        }
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+
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         return 0;
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 }
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diff --git a/src/core/mount.h b/src/core/mount.h
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index d6987e6fa1..353222000f 100644
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--- a/src/core/mount.h
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+++ b/src/core/mount.h
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@@ -130,3 +130,4 @@ const char* mount_result_to_string(MountResult i) _const_;
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 MountResult mount_result_from_string(const char *s) _pure_;
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 void warn_if_dir_nonempty(const char *unit, const char* where);
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+const char *mount_get_fstype(const Mount *m);
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diff --git a/units/tmp.mount b/units/tmp.mount
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index 8c53a87052..af0cf4a551 100644
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--- a/units/tmp.mount
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+++ b/units/tmp.mount
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@@ -13,7 +13,6 @@ ConditionPathIsSymbolicLink=!/tmp
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 DefaultDependencies=no
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 Conflicts=umount.target
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 Before=local-fs.target umount.target
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-After=swap.target
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 [Mount]
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 What=tmpfs